id:A125905 - OEIS Search Results

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a(0)=1, a(1)=-4, a(n)=-4*a(n-1)-a(n-2) for n>1.

+0
2

1, -4, 15, -56, 209, -780, 2911, -10864, 40545, -151316, 564719, -2107560, 7865521, -29354524, 109552575, -408855776, 1525870529, -5694626340, 21252634831, -79315912984, 296011017105, -1104728155436, 4122901804639, -15386878263120 (list; graph; listen)

	OFFSET	`0,2`
	FORMULA	`G.f.: 1/(1+4*x+x^2)`
	CROSSREFS	`Cf. A001353, A106707.` `Adjacent sequences: A125902 A125903 A125904 this_sequence A125906 A125907 A125908` `Sequence in context: A010905 A001353 A106707 this_sequence A026030 A047038 A158500`
	KEYWORD	`easy,sign`
	AUTHOR	`Philippe DELEHAM (kolotoko(AT)wanadoo.fr), Feb 04 2007`

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Last modified November 7 16:45 EST 2009. Contains 166093 sequences.

AT&T Labs Research